He’s not ready to saddle up just yet, but we’re happy to report that everyone’s favorite TV cowboy, Rex Trailer, is on the mend. The host of “Boomtown,’’ the western-themed children’s show that entertained generations of wannabe buckaroos, is recovering in Florida from a nasty bout of pneumonia. “Keep sending out those good thoughts and feelings,” said Trailer spokesman Michael Bavaro, who directed the 2005 documentary “Rex Trailer’s Boomtown.’’ “He’s doing much better.” Trailer, 84, was visiting his sister in Florida for Christmas when he fell ill. Fans can check www.rextrailer.com for more information.